I'm curious, how did you manage to find that picture without knowing the name? Someone should make an online tool search engine where you can sketch a picture of a tool/jig/fixture and it tells you what it's called and where to find it.
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Shimon RuraJan 25 '11 at 3:57

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Ha, this question is already the 3rd result in a google search for "pattress jig".
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Mike PowellJan 25 '11 at 13:58

1 Answer
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B&Q stock them in the UK. However they can only be purchased from a physical store not online, the ean code is 03619377 and the cost is £7.68. (A B&Q store can order one if needed based on the ean code.)